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<h1 id="37">3.7.事件标志库</h1>
<h1 id="371">3.7.1.描述</h1>
<h2 id="_1">事件标志对象</h2>
<p>事件标志对象是由Lua虚拟机调用玄武OS内核API创建的，Lua虚拟机通过玄武OS内核对象的
引用计数间接管理事件标志对象。</p>
<p>在Lua语言中，通过<strong>事件标志对象强指针</strong>来表示事件标志对象。</p>
<h2 id="_2">事件标志对象强指针</h2>
<p>在Lua语言中，<strong>事件标志对象强指针</strong>是一种userdata，由C语言实现，等价于玄武OS内核中
的<strong>事件标志对象描述符</strong>。</p>
<p>Lua虚拟机每创建一个<strong>事件标志对象强指针</strong>，都会增加相关联事件标志的引用计数，
Lua虚拟机每回收一个<strong>事件标志对象强指针</strong>，都会减少相关联事件标志的引用计数。</p>
<h1 id="372lua-api">3.7.2.Lua API参考</h1>
<h2 id="xwosflg"><strong>包：xwos.flg</strong></h2>
<h4 id="xwosflgnewnum">xwos.flg.new(num)</h4>
<ul>
<li>简介：新建一个事件标志</li>
<li>参数num：(number, 输入)事件的数量</li>
<li>返回值：(userdata)新的事件标志对象的强引用指针</li>
<li>示例：</li>
</ul>
<pre><code class="lua">myflg = xwos.flg.new(32)
</code></pre>

<h2 id="flgsp"><strong>类：flgsp</strong></h2>
<ul>
<li>说明：事件标志对象强指针类</li>
</ul>
<h4 id="flgspbmp">flgsp:bmp()</h4>
<ul>
<li>简介：新建一个位图，位的数量与事件标志中的事件数量相等</li>
<li>参数flgsp：(userdata, 输入)类成员函数的this参数，事件标志对象的强引用指针</li>
<li>返回值：(userdata)新的位图</li>
</ul>
<h4 id="flgspnum">flgsp:num()</h4>
<ul>
<li>简介：获取事件标志中事件（位）的数量</li>
<li>参数flgsp：(userdata, 输入)类成员函数的this参数，事件标志对象的强引用指针</li>
<li>返回值：(number)数量</li>
</ul>
<h4 id="flgspbindsel">flgsp:bind(sel)</h4>
<ul>
<li>简介：绑定事件标志对象到信号选择器</li>
<li>参数flgsp：(userdata, 输入)类成员函数的this参数，事件标志对象的强引用指针</li>
<li>参数sel：(userdata, 输入)信号选择器对象的强引用指针</li>
<li>返回值：(number)错误码<ul>
<li>0：成功</li>
<li>-ECHRNG: 位置超出范围</li>
<li>-EALREADY: 同步对象已经绑定到事件对象</li>
<li>-EBUSY: 通道已经被其他同步对象独占</li>
</ul>
</li>
</ul>
<h4 id="flgspunbindsel">flgsp:unbind(sel)</h4>
<ul>
<li>简介：从信号选择器上解绑事件标志对象</li>
<li>参数flgsp：(userdata, 输入)类成员函数的this参数，事件标志对象的强引用指针</li>
<li>参数sel：(userdata, 输入)信号选择器对象的强引用指针</li>
<li>返回值：(number)错误码<ul>
<li>0：成功</li>
<li>-ENOTCONN: 同步对象没有绑定到事件对象上</li>
</ul>
</li>
</ul>
<h4 id="flgspunbindsel_1">flgsp:unbind(sel)</h4>
<ul>
<li>简介：从信号选择器上解绑事件标志对象</li>
<li>参数flgsp：(userdata, 输入)类成员函数的this参数，事件标志对象的强引用指针</li>
<li>参数sel：(userdata, 输入)信号选择器对象的强引用指针</li>
<li>返回值：(number)错误码<ul>
<li>0：成功</li>
<li>-ENOTCONN: 同步对象没有绑定到事件对象上</li>
</ul>
</li>
</ul>
<h4 id="flgspread">flgsp:read()</h4>
<ul>
<li>简介：发布事件标志</li>
<li>参数flgsp：(userdata, 输入)类成员函数的this参数，事件标志对象的强引用指针</li>
<li>返回值：{(number)错误码, (userdata)位图}<ul>
<li>错误码<ul>
<li>0：成功</li>
<li>&lt;0：错误</li>
</ul>
</li>
<li>位图：事件标志位图</li>
</ul>
</li>
</ul>
<h4 id="flgsps1mmsk">flgsp:s1m(msk)</h4>
<ul>
<li>简介：同时设置多个事件标志位</li>
<li>参数flgsp：(userdata, 输入)类成员函数的this参数，事件标志对象的强引用指针</li>
<li>参数msk：(userdata, 输入)事件的位图掩码</li>
<li>返回值：(number)错误码<ul>
<li>0：成功</li>
<li>&lt;0：错误</li>
</ul>
</li>
</ul>
<h4 id="flgsps1ipos">flgsp:s1i(pos)</h4>
<ul>
<li>简介：设置单个事件标志位</li>
<li>参数flgsp：(userdata, 输入)类成员函数的this参数，事件标志对象的强引用指针</li>
<li>参数pos：(number, 输入)事件的序号</li>
<li>返回值：(number)错误码<ul>
<li>0：成功</li>
<li>&lt;0：错误</li>
</ul>
</li>
</ul>
<h4 id="flgspc0mmsk">flgsp:c0m(msk)</h4>
<ul>
<li>简介：同时清除多个事件标志位</li>
<li>参数flgsp：(userdata, 输入)类成员函数的this参数，事件标志对象的强引用指针</li>
<li>参数msk：(userdata, 输入)事件的位图掩码</li>
<li>返回值：(number)错误码<ul>
<li>0：成功</li>
<li>&lt;0：错误</li>
</ul>
</li>
</ul>
<h4 id="flgspc0ipos">flgsp:c0i(pos)</h4>
<ul>
<li>简介：清除单个事件标志位</li>
<li>参数flgsp：(userdata, 输入)类成员函数的this参数，事件标志对象的强引用指针</li>
<li>参数pos：(number, 输入)事件的序号</li>
<li>返回值：(number)错误码<ul>
<li>0：成功</li>
<li>&lt;0：错误</li>
</ul>
</li>
</ul>
<h4 id="flgspx1mmsk">flgsp:x1m(msk)</h4>
<ul>
<li>简介：同时翻转多个事件标志位</li>
<li>参数flgsp：(userdata, 输入)类成员函数的this参数，事件标志对象的强引用指针</li>
<li>参数msk：(userdata, 输入)事件的位图掩码</li>
<li>返回值：(number)错误码<ul>
<li>0：成功</li>
<li>&lt;0：错误</li>
</ul>
</li>
</ul>
<h4 id="flgspx1ipos">flgsp:x1i(pos)</h4>
<ul>
<li>简介：翻转单个事件标志位</li>
<li>参数flgsp：(userdata, 输入)类成员函数的this参数，事件标志对象的强引用指针</li>
<li>参数pos：(number, 输入)事件的序号</li>
<li>返回值：(number)错误码<ul>
<li>0：成功</li>
<li>&lt;0：错误</li>
</ul>
</li>
</ul>
<h4 id="flgspwaittrigger-consumption-origin-msk-op">flgsp:wait(trigger, consumption, origin, msk, [op])</h4>
<ul>
<li>简介：等待并获取事件标志</li>
<li>参数flgsp：(userdata, 输入)类成员函数的this参数，事件标志对象的强引用指针</li>
<li>参数trigger：(string, 输入)事件触发条件<ul>
<li>"sa"：所有事件位被置1触发</li>
<li>"so"：任意事件位被置1触发</li>
<li>"ca"：所有事件位被清0触发</li>
<li>"co"：任意事件位被清0触发</li>
<li>"ta"：所有事件位发生翻转触发</li>
<li>"to"：任意事件位发生翻转触发</li>
</ul>
</li>
<li>参数consumption：(boolean, 输入)是否消费事件，线程可以选择是否<strong>消费</strong>事件，
    <strong>消费</strong>事件是指，当线程等到事件被唤醒，可以选择是否<strong>清除</strong>事件标志。
    <strong>清除</strong>的含义是：<ul>
<li>当线程等待的是位图中的事件位被置1，<strong>清除</strong>是指将这些位清0；</li>
<li>当线程等待的是位图中的事件位被清0，<strong>清除</strong>是指将这些位置1；</li>
</ul>
</li>
<li>参数origin：(userdata)事件的位图掩码<ul>
<li>当参数trigger取值"sa"，"so"，"ca"，"co"：(输出) 返回触发时事件对象中位图状态</li>
<li>当参数trigger取值"ta"，"to"：<ul>
<li>(输入) 用于比较的初始值</li>
<li>(输出) 返回触发时事件对象中位图状态</li>
</ul>
</li>
</ul>
</li>
<li>参数msk：(userdata, 输入)事件的位图掩码，表示只关注掩码部分的事件</li>
<li>可选参数op：<ul>
<li>"t"：(string, 输入)尝试等待并获取事件标志，若事件标志的值小于等于0，立即返回，
    不会等待；</li>
<li>time：(number, 输入)期望的等待时间，超时后返回错误码-ETIMEDOUT。</li>
</ul>
</li>
<li>返回值：(number)错误码<ul>
<li>0：无错误</li>
<li>-EINVAL：参数错误</li>
<li>-ENODATA：尝试失败，仅当存在可选参数"t"时才会出现此错误值</li>
<li>-ETIMEDOUT：超时</li>
<li>-EINTR：等待被中断</li>
<li>-ENOTINTHD：不在线程上下文中</li>
</ul>
</li>
</ul></div>
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